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Manganese is a part of many enzyme systems, including the enzymes involved in blood sugar control, energy metabolism, and thyroid hormone function. Manganese also participates in the antioxidant enzyme, superoxide dismutase, or SOD.
It is used in black paints and to color glass purple. Manganese is responsible for the purple color in amethyst. Compounds of manganese are used in feed supplements and fertilizers. Biological Benefits. Manganese is a critical trace element. Manganese seems to lend a pliant, flexible quality to animal bone. A manganese deficiency in bone leads to brittle, easily broken bones.